Ubuntu 20.04

Ubuntu 20.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide

  • August 14, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 14 August 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4470-1 Related CVEs: CVE-2017-6318 CVE-2020-12861 CVE-2020-12862 CVE-2020-12863 CVE-2020-12864 CVE-2020-12865 CVE-2020-12866 CVE-2020-12867 Upstream summary: Kritphong Mongkhonvanit discovered that sane-backends incorrectly handled certain packets. A remote attacker could possibly use this issue […]

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How To Use Winston to Log Node.js Applications on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Use Winston to Log Node.js Applications on Ubuntu 20.04

  • August 14, 2020
  • Linux
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Winston is a versatile logging library and a popular logging solution available for Node.js applications. Winston’s features include support for multiple storage options, log levels, log queries, and a built-in profiler. In this tutorial, you will use Winston to log a Node/Express application that you’ll create as part of this process. You’ll also see how to combine Winston with Morgan, another popular HTTP request middleware logger for Node.js.

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Common Problems 117439

Ubuntu 20.04 boot stuck in initramfs prompt

  • August 13, 2020
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 13 August 2020 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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Ubuntu 20.04でOpenVPNサーバーをセットアップ・設定する方法 — step-by-step Linux tutorial on Progressive Robot

Ubuntu 20.04でOpenVPNサーバーをセットアップ・設定する方法

  • August 12, 2020
  • Linux
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OpenVPNは、公開インターネット上でプライベートネットワークを安全に構築したり参加したりできるようにするオープンソースの仮想プライベートネットワーク（Virtual Private Network: VPN）アプリケーションです。　 このチュートリアルでは、Ellipic Curve Cryptography（ECC）を使用して、Ubuntu 20.04 （Focal server）にOpenVPNをインストールして設定する方法を学びます。 　また、Windows、macOS、iOS、Android、LinuxクライアントをVPNに接続する方法も学びます。

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Common Problems 117501

Ubuntu 20.04 LTS – memory pressure triggers OOM kills and random restarts – Fix & Prevention

  • August 11, 2020
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 11 August 2020 Affected versions: Ubuntu 20.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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Ubuntu 20.04 — netqmail — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — netqmail — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • August 9, 2020
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 9 August 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4556-1 Related CVEs: CVE-2005-1513 CVE-2005-1514 CVE-2005-1515 CVE-2020-3811 CVE-2020-3812 Upstream summary: It was discovered that netqmail did not properly handle certain input. Both remote and local attackers could use this vulnerability […]

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Common Problems 117462

Ubuntu 20.04 LTS – system boots to grub rescue after package update – Fix & Prevention

  • August 7, 2020
  • Linux
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🔴 Critical   ⏱ 5–30 min  Last verified: 7 August 2020 Affected versions: Ubuntu 20.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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How To Install Ruby on Rails with rbenv on Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Install Ruby on Rails with rbenv on Ubuntu 20.04

  • August 6, 2020
  • Linux
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Ruby on Rails is one of the most popular application stacks for developers looking to create sites and web apps. Using rbenv will provide you with a solid environment for developing your Ruby on Rails applications as it will let you easily switch Ruby versions, keeping your entire team on the same version. In this tutorial, we will guide you through the Ruby and Rails installation processes with rbenv and gem.

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